I'm inclined to classify modern intelligence as an evolutionary cul de sac. Once you've evolved Turing-equivalence, g=diminishing returns path.
Stupidity is the maladaptive subset of a larger class of generative evolutionary behaviors that are not in the intelligence cul de sac.
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Every intelligent act/person is intelligent in the same way
Every stupid act/person is stupid in a different way
Intelligence and stupidity aren't duals, and not even very correlated. The same person/act can be both at once.
Your stupidities define you far more than your IQ

